An agricultural vehicle and an auxiliary device thereof. The auxiliary device includes an auxiliary wheel set and a movable arm. The auxiliary wheel set is spaced from the agricultural carrier by being connected by the movable arm, so that the agricultural carrier will not fall over due to loss of balance. In order to solve the problem of reducing labor costs when spraying pesticides, and improving the operational convenience of agricultural vehicles.一種農用載具及其輔助裝置，輔助裝置包含一輔助輪組以及一活動臂，藉由活動臂連接使輔助輪組與農用載具間隔設置，使農用載具不會因喪失平衡而傾倒，用以解決噴灑農藥時減少人工勞動成本，提升農用載具的操作方便性。
